Gob's "got it” (3)
I believe the answer is:
aye
'gob's got it' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aye that I've seen before include "One voting in favour" , "Entirely one" , "Yes answer in voting" , "Positive voting response" , "An affirmative vote" .)